Flue dust, copper-refining

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: No GLP study but other quality assurance

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Remarks:

other quality assurance

Type of method:

thermal analysis

Test material

Test material information

Constituent 1

Reference substance name:

Flue dust, copper-refining

EC Number:

266-966-2

EC Name:

Flue dust, copper-refining

Cas Number:

67711-90-4

IUPAC Name:

flue dust, copper refining

Details on test material:

Sample collection made according to ECI/REACH Copper Consortium Standards Protocols (see IUCLID section 1.4)
The studied flue dust samples are fine- grained, the D50 value is for all samples below 20µm. They contain 9.18- 51.0% lead, 0.52- 9.58% copper, 6.3- 43.9% zinc, 0.09- 2.8% arsenic, and 1.15- 14.7% sulfur (see iuclid 4.23)
B11 flue dust from Secondary smelters (representative), sample code: MC_B11_522_xxx_0904, lab code: 09TT03192
B11 flue dust from primary smelter (blast furnace) (dried filtered slime, homogenized), sample code: KGHM_B11_006_0904, lab code: 09TT03514
B11 flue dust from primary smelter (electric furnace) (composite, from one silo), sample code: KGHM_B11_005_0904, lab code: 09TT03513

Results and discussion

Melting / freezing point

Melting / freezing pt.:

100 - 170 °C

Any other information on results incl. tables

Table6:Melting

Sample	Flue dust	Flue dust	Flue dust
Sample	B11	B11	B11
Outotec code	09TT03192	09TT03513	09TT03514
First endothermic peak	139 - 175 °C	100 - 123 °C	869 - 1017 °C
Decomposition and/or melting starts	139 °C	100 °C	170 °C

During the melting tests of the three (3) flue dust samples were heated in Al₂O₃crucible using nitrogen atmosphere.

09TT03192

The endothermic peaks in the curve are at the temperature ranges 139 – 175 °C, 748 – 760 °C, 1202 – 1236 °C, 1304 – 1323 °C and 1470 – 1482 °C. The mass of the sample decreases at the temperature range 139 – 175 °C, again at ~ 400 – 780 °C and then > 1000 °C. These phenomena indicate, that some components of the sample start to decompose (for instance chloride - hydrate) and to melt (for instance zinc chloride hydrate) already at e temperature range 139 - 175 °C. 

09TT03513

The endothermic peaks in the curve are at the temperature ranges 100 – 123 °C, 259 – 308 °C, 620 – 695 °C, 742 – 835 °C and 913 – 1031 °C. The mass of the sample starts to decrease at the temperature ~800 °C. First peaks indicate that sample has been a bit wet or/and hydrated. Next peaks indicate decomposition and the last peaks melting and evaporation.   

09TT03514

The endothermic peaks in the curve are at the temperature ranges 869 – 1017 °C and 1034 – 1194 °C. The mass of the sample decreases at the temperature range ~170 – 320 °C and strongly at 869 – 1017 °C together with the first peak. These phenomena indicate, that some components decompose and evaporate before melting, which starts at the temperature range 1034 – 1194 °C. The main components of this dust sample are PbS (melting point 1118 °C), ZnS (melting point 1185 °C) and carbon.

Applicant's summary and conclusion

Executive summary:

Based on the TG/DSC measurements, the decomposition and melting of the hydrate-containing flue dusts 09TT03192 and 09TT03513 start at 139^oC and 100°C while for the other sample 09TT03514 the decomposition starts at 150^oC.